Grinding wheel radius and angle dresser



Aug. 16, 1949. R. E. DAHL I GRINDiNG WHEEL RADIUS Al lD ANGLE DRESSER 2 Sheets-Sheet 1 Filed May 24, 1945 .l N V EN TOR. l 50567 545515 4WZZ Q 1 $3 'WMHIM W Aug. 16, 1949. RE. DAHL. 2,479,101

GRINDING WHEEL RADIUS AND ANGLE DRESSER Filed May 24, 1945 Z'SheetS-Sheet 2' a 4 ES 1;

m A T J9 INVENTOR. a0 54 fiberwaw BY 55 77W Patented Aug. 16, 1949 GRINDING RADIUS AND DRESSER ligho t Dab C ce Ills, assignoif to: 35mm rmdiiets 39- Qicsiro, .11 qnmn sitimlqn Application Mai- 24, 1945, Serial No. 595,551 6 claim (01, 1.251911) Another object of my in eg 1 to provide. a

radius; and an le W136 dr giguc ;simplicity that: it, may be, eh? i. supply an iEWQIifilltiQQi-t!) Q13 QI59A= able 00 t,, i ner nd iz iwtii 0,1: a pear from the spa fisat qn, In the a einpmyi igi with; min part of the instant specification and. whioh are tojbe read: in eona'imstig i. in whi like reference numera are, WJQCEFJWQ 512!: parts in the tariqlfivi wheeldreasem- Fi ure his a, i le ieietaitioni of ngdswifie in Figure 1;

Figure 3 it imnt fllgmtm my wh l dresser, showin -the pap si 1,139 23m angular face-antheg-gin gggwhee};

' i ure 4 is. a imam-9J5: View sli wm motion of the diamond uess n it radius on a; wheel;

i ure 5 is a v ew similar b in the motion ofthe diamond. n 31238 a .0 9 surface on the abrasivewhsifi i Figure .6 a. View Simiiar a Eisiires, 4' end 5 showing the motion oi-th) qiggnond in uttingan, anguiar surfarce on thefgi din V Figure 7 is a diagram-mam vie, showin he motion r the diamend' fei-ming a. radius-tan i ii to an an ular. su-rfaceon the winn n wheel;

Figure 6: is a sefitioiml vifiwialififi time the 111.19 8:.8.o'f Figure l;

Figure 9 is. a fra mentaiiys igw: taken; .aieng. the line .9. 9.;0.f Figure-ii Figure. in is. a iQQ l eisen along the Fi ure .11: is an t rial. View: along th line Hr of Fi ure 1. m i

{ Fi ure is a" mtiimai. vitw taksn; alqiis. the

; base, s, a 5.1 6s 5 nt nt lt-nix: .15 tifoxi q iitemplates. a suit-=- tin adapted to be @11 5 r: br dmtative y-posi ionsd on e m mbe Mi! arran e en is suc th t the m; may be rot ted thr h 36.9 deg ee BJAQ ai lqrated; m an i ro id d to lmiica ez he angle to wh t the ide is 19 ti ed, Mo n ed-1 .2. he fields il il fi mo ent iQ i ilev amin an a m nii'ifipsafi ti n s i Iti a. 128% @Xtsis tne aaiiety uariiro ii thus: ex editin he workmen 20m. iiizssib gi o table ton on wh' hm: position: 1959 5 29 wh e; and mi k; 5; 1; in high pr cision min ng: 7 that the precie on Qt" final mil; i more accurate than matoig the tool used to pe form-thework.

More partmuiariy; referring to the. draw ings, a base of aniy guitable construction is for-med by a bottom pli'ite. I, carrying a, vertical or sup: porting plate 2-. In the-form shown i-nthe draw-. ings, the supporting-plate iis secured to the bottom plate I by-mehns 0! machine screws 3. The ve r-tica;1orsuppoz ting plate-2 is provided with a notched pottion'l adapted to be used in conneetion with the qgiibmtibns for-med on" the rear surfaoe of --tk 1 e g' -z ide 5 The guide is formed with a, cent a'l hole and epuntez sunlg portion in which s osi pnfid' he h a i5v Qf. be t -w passes th ough an opening" in the vertical plate 2 The end Q h bo t z s issiwit x d 8 en a ing a my; Q whigh maty be provided wi th a knurled o ion. .Z-.. The 9 @fiis as th Stud t 1- han an is p pyi ed a. kirt por n, n, pqr iq i 10,7 7 P ovidfi a.

spring ll ag gptgs to; f ionaliy pqii i n, t 511 1 st d heed again i.fi;IQt%i9lrew n the nut 9 411. tlistli fim 8,, s amps. the guide 5, between he mQIie Q 1i an me. e tm ipiats: 2, The uide m nim? 5. is-ipmyi ed with doveta l o ve. in which a. s ide mm: 13 pQ itiongd for lo gitudinal. .niowrnfint, the guid A set screw :4 is. vide 1 sagufinghe slide 2 an; is Yen. giifitmi urgd, to the Iiousci, W 1

ends of the guide member by machine screws l5 and I6, are a pair of closure members I! and IS. The closure members carry positioning screws l9 and 20. The function of these positioning screws is to govern the amplitude of motion of the slide member l3. A hub 2| is fixedly secured to the slide |3 by means'of machine screws 22 and 23. Clamped between the hub 2| and the slide I3 by the screws 22 and 23, is a dust plate 24, as can readily be seen by reference to Figure 11. Rotatably carried by the hub 2| is a revolving head 25. The head 25 is provided with a plurality of peripheral openings 25 adapted to receive a head handle 21. The head handle may be inserted in any suitable manner into any of the openings 26. If desired, the openings may be internally threaded and the handle may be provided with a threaded portion for coaction therewith, and ob viously a plurality of handles may be used if desired. The lower portion of the revolving head 25 is formed with a slot into which one end of th diamond-holding arm 28 is adapted to be positioned by means of a screw 29. The screw 29 is annular in form and is internally threaded to receive a set screw 44. The end of the arm 28 is provided with a pivoted clamp 30 which, through clamping screw 3|, is adapted to secure the diamond holder 32 in any desired position. The diamond holder 32 carries a diamond 33, or other suitably hard cutting point, depending on the nature of the abrasive wheel to be dressed. The diamond holder 32 is provided with calibrations 34 adapted to coact with the upper surface of the arm 28.

In operation, if it be desired to dress the grinding wheel 35 with an angular surface such as shown in Figure 6, the guide 5 is adjusted to the desired angle by means of the calibration 36 formed on the back of the guide member 5 coactting with the notch 4. To perform this adjustment, the nut 9 is first loosened, permitting the guide member 5 to be rotated around the stud head 6. If extreme'accuracy is required, the angle of adjustment may be checked by means of an angle gauge through the surface 31 formed on the bottom of the guide 5. The base I is then in position adjacent the grinding wheel 35, and secured in any desired manner as, for example, by a magnetic surface plate, clamp or the like, known to the art. The parts will be in the position shown in Figure 3. The set screw I4 is then loosened, and the stop screws l9 and 20 are adjusted to give the desired amplitude of motion across the face of the grinding wheel. The rotatable head 25 is then adjusted to any desired angle such as one at which arm 28 is below hub 2| and the diamond point 33 is in alignment vertically with the axis of hub 2|. This adjustment is facilitated by the calibrations 38 formed on the surface 39 of the rotatable head 25. A suitable reference point 40 is formed on the surface 4| of the hub 2|. The head 25 is set in this position against rotation with respect to the hub 2| by means of the set screw 44 which is positioned in the annular securing'screw 29. A suitable bushing member 42 may be provided to prevent marring the smooth bearing surface 43 of the hub 2|. A handle 21 is then inserted in an appropriate opening 26. The diamond 33 is then adjusted, by means of the clamp 30 and the clamping screw 3|, to the desired working position. The grinding wheel is then rotated and the slide I3 is reciprocated in the guide member 5 through th handle 21, manually, through the amplitude of motion determined by the stop screws l3 and 20. The resultant motion is shown diagrammatically in Figure 6.

If it be desired to form a convex surface on the grinding wheel, this may be easily achieved by means of my invention, either tangent to a horizontal or angular surface. For example, if a convex surface, such as shown in Figure 4, is desired on the grinding wheel, tangent to a horizontal surface, the guide member 5 is set horizontally by means of the calibrations 35, in the manner described above. The set screw I4 is positioned to prevent motion of the slide l3. The diamond is positioned below the axis of the hub 2| to produce a convex surface. The radius of the surface is determined by the distance between the axis of the hub 2| and the diamond. This radius may be set by means of the calibrations 34 on the diamond holder, or by means of gauges if desired. The dresser is positioned as before, adjacent the grinding wheel to be dressed, The set screw 44, however, is retracted to permit the rotating head 25 to rotate freely, and the diamond point is moved along a locus describing the desired radius and by means of the handle 2]. It is in such operations as this that the calibrations 38 find their main use which is to indicate the amount of arc travel of head 25 and facilitate obtaining the desired amount when describing a radius, for example by indicating the proper setting of arc travel stops.

A concave grinding surface may be formed on the abrasive wheel, such as shown in Figure 5, in the manner described above. It is to be noted, however, that in this case the diamond point is above the axis of the hub 2 I.

It will be obvious to those skilled in the art that my dresser may be used to form any combination of surfaces or any desired contour on the grinding surface of the abrasive wheel by a plurality of successive dressing operations. In Figure 7, for example, a curved surface having a, desired radius tangent to an angular surface is shown.

It will be seen that I have accomplished the objects of my invention. I have provided a radius and angle dresser of simple and cheap construction which, nevertheless, may be employed to perform accurate operations necessary for precision grinding. The arrangements of parts are such that the may be speedily and'accurately employed with safety to the operator. I may employ my device to perform a radius which is tangent to a surface having any given angle with the vertical, an operation heretofore very difiicult by any of the means of the prior art. Once my dresser is positioned, a simple motion by the operator performs the accurate dressing, thus making for extreme accuracy and speed and ease of work. The simplicity of set-up, coupled with the ease of operation, presents advantages not found in existing dressers. My dresser is designed to true the grinding wheel from the bottom because this is the line of contact with the work when the grinding Wheel is being used to perform its grinding operation. Furthermore, it is not necessary to move the guard from its position over the grinding wheel. It will be observed further that a table adjacent the grinder may be positioned relatively close to the grinding surface of the grinding wheel, thus making for greater accuracy by eliminating possible vibration.

It is obvious that changes may be made in the particular construction shown and described without departing from the spirit of my invention. It is therefore to be-understood that I do- ,a ieamr 'n'ot wish to" be limited to the particular details shown and described exceptas stated 'in the-aprpendedclaims; v

Having thus described my invention; what I claim'i's:

1. An angleand radius: dresser for abrasive wheels including in combination a base, a guide rotatably mounted onsaid base for angular adjustment from a horizontal position to any-- de sired angle-includingrarstraightangle; means for releasably securing said guide in any such angular position of adjustment, a member slidably mounted on said guidefor movement between limiting positions on opposite sides of, the; axis of rotation" of said guide; releasable means for lbclr'ingsaidmember in'any'position within said limits of movement, a head rotatably supported by said slidable member and rotatable with respect to said member about an axis extending parallel with the axis of rotation of said guide, a cutting tool, means carried by said head for supporting said cutting tool, and means for releasably locking said head against rotation relative to said slidable member in any angular position to which said head is rotated.

2. An angle and radius dresser for abrasive wheels including in combination a base, a guide rotatably mounted on said base for angular adjustment from a horizontal position to any desired angle including a straight angle, means for releasably securing said guide in any such angular position of adjustment, a member slidably mounted on said guide for movement between limiting positions on opposite sides of the axis of rotation of said guide, releasable means for looking said member in any position within said limits of movement, a head rotatably supported by said slidable member and rotatable with respect to said member about an axis parallel with the axis of rotation of said guide, a pointed dressing tool, an arm carried by said head and extending there from substantially parallel to the axes of rotation of said head and guide, means mounting said tool on said arm for adjustment relative thereto to position the point of said tool on one side or the other side of the axis of rotation of said head.

3. An angle and radius dresser for an abrasive wheel comprising a support, a stud extending from said support, a block journalled on said stud for angular adjustment about the axis tion to the angle of adjustment of the first mentioned block about the axis of the stud, a second stud projecting from said block and having its axis parallel to the axis of the first mentioned stud, a disc mounted on said second stud for angular movement to any desired angle, an arm secured to said disc and extending therefrom substantially parallel to the axis of said studs, a dressing tool, means for adjustably mounting said tool on said arm for adjustment transverse to the axis of rotation of said disc to one or the other side of said axis, means for releasably locking said slide block against slidable movement in any desired position spacing the axis of the second stud a predetermined distance from the axis of the first mentioned stud, and means for locking said disc in any angular position of adjustment about the axis of the second stud.

4. An angle and radius dresser for an abrasive wheel comprising a support, a stud extending from said support, a block journalled on said stud 6, for angular adj ustment about the axis: thereof to= any 'desired angle, said block: havingxaa guidee way therein, a slide-block mounted in saidiguide way-for'movement: therealong duringdressingaof thean'glesurface corresponding ininclination to the angle of adjustmentof the first mentioned block abouttheaxis ofthestud; asecond stud projecting from said block: and having. its axisparallel tb the" axis of th'efirst mentionedmtud, a;

disc mounted on said second studi for angularm'ovem-ent to any desired'angle, an arm:=.secur,edin said diseand extending therefrom substanti ally: parallel to theaxes -of said studs, atdressing t'ool, means for adj ustably: mounting said: tool on saidi arm for adjustment transverse to the axis o'fi rotatiom of-"said disc to one on the other: side of said axis, means for releasably locking said slide block against slidable movement in any desired position spacing the axis of the second stud a predetermined distance from the axis of the first mentioned stud, means for locking said disc in any angular position of adjustment about the axis of the second stud, and means for releasably locking the first mentioned block in any angular position of adjustment about the axis of the first stud.

5. An angle and radius dresser for an abrasive wheel comprising a support, a stud extending from said support, a block journalled on said stud for angular adjustment about the axis thereof to any desired angle, said block having a guideway therein, a slide block mounted in said guideway for movement therealong during dressing of the angle surface corresponding in inclination to the angle of adjustment of the first mentioned block about the axis of the stud, a second stud projecting from said block and having its axis parallel to the axis of the first mentioned stud, a disc mounted on said second stud for angular movement to any desired angle, an arm secured to said disc and extending therefrom substantially parallel to the axes of said studs, a dressing tool, means for adjustably mounting said tool on said arm for adjustment transverse to the axis of rotation of said disc to one or the other side of said axis, means for releasably locking said slide block against slidable movement in any desired position spacing the axis of the second stud a predetermined distance from the axis of the first mentioned stud, means for locking, said disc in any angular position of adjustment about the axis of the second stud, and means adjustably mounted on said first mentioned block and projecting into the path of movement of said slide block for adjustment longitudinally of the guideway to engage and limit the movements of the slide block.

6. An angle and radius'dresser for an abrasive wheel comprising a support, a stud carried by and projecting from said support, a first block journalled intermediate its ends on said stud for angular adjustment about the axis of the stud to any desired angle, said block having a guideway therein extending transverse to the axis of said stud on opposite sides thereof, a second block slidably mounted in said guideway for movement therealong from one to the other side of the axis of said stud, a second stud carried by said slide block and projecting therefrom with its axis substantially parallel to the axis of the first stud and movable with said slide block to position the axis of the second stud eccentric to the axis of the first stud on one s ide or the other side of the axis of the first stud, a collar mounted on said second stud for angular movement through and desired means adjustably carried by the first block for 10 engaging and limiting movement of the slide block in one direction with respect to the axis of the stud, means adjustably carried by the first block for engaging and limiting movement of the slide block in the opposite direction with respect to the axis of the first stud, releasable means for locking said slide block in any position within its limits of movement, and means for releasably locking said collar in any angular position of adjustment about the axis of the second stud.

ROBERT E. DAI-IL.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 2,127,614 Parker Aug. 23, 1938 2,301,610 Brady Nov. 10, 1942 5 2,355,020 Turrettini Aug. 1, 1944 2,377,934 Greig June 12, 1945 

